3.5.1 Simple and Facilitated Diffusion Flashcards
1
Q
diffusion
A
- the tendency for particles to move from an area of high concentration to an area of low concentration. The rate of diffusion depends on four main factors:
1. The concentration gradient—the relative density of a chemical substance
2. The temperature—molecules move faster at higher temperatures
3. The charge—the net positive or negative charge on a molecule
4. The diameter of the molecule—the width of a molecule
2
Q
facilitated diffusion
A
- applies to the movement of molecules across biological membranes and down a concentration gradient with the aid of special transport proteins located in the cell membrane
3
Q
Which of the following are not molecules that can facilitate passive diffusion?
A
- ATP regulated enzymes
4
Q
After placing Paramecium into a salt solution, you would expect that
A
- the cell will expend energy to move sodium out of the cell
5
Q
Which of the following is not a determinant of the speed of diffusion?
A
- Shape
6
Q
Which of the following statements concerning diffusion is not true?
A
- Diffusion is an energy-dependent process.
7
Q
Which of the following answers includes all of the other terms on the list?
A
- passive transport